Carborator question - Chevelle Tech
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post #1 of 18 (permalink) Old Mar 29th, 19, 6:11 PM Thread Starter
Mike
 
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Carborator question

I have a 1965 Malibu SS Convertible. The Original Carborator(Rochestor) died after several rebuilds. Looking at a Holly or Edelbrock. Which one is best?
Mike
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post #2 of 18 (permalink) Old Mar 29th, 19, 6:45 PM
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Mike
 
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Re: Carborator question

You are going to get a zillion answers.... personally I like the AFB/Carter/Edelbrock over the Holly but there are probably twice as many that like the Holly or other variations that are out there. (Actually, I think the electronic F.I. is the way to go these days....
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post #3 of 18 (permalink) Old Mar 29th, 19, 11:02 PM
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Re: Carborator question

Was it a Qjet? If so replace it with a later model one they were a lot better that the old ones.

Jim

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post #4 of 18 (permalink) Old Mar 29th, 19, 11:25 PM
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Re: Carborator question

For easy to work on without gaskets sticking the Edelbrock/ AFB is really good.
Get the 600 cfm one if you are close to stock and do not rev past 6000.
They come into the main circuit much sooner and if you have a weak signal to the carb they are more forgiving.
The old 600 vacuum secondary Holley is pretty good also.
Both will need an adapter plate if your intake is a spread bore.

I run Edelbrocks and Holleys both. and sometimes I run a Q jet.
But i know how to tweak the most from all of them so it really does not matter what carb I run after tuning them they all run almost exactly the same.

Friend of mine 35 years ago had a fresh built engine that he kept saying the rings would not seat.
I told him it was his carb a 750 Holley 3310 vacuum secondary acting up.

2 weeks later I ask him if the rings are seated and he said NO still a lot of fuel in the oil and smells terrible.

He worked at a machine shop and parked around back.
I snuck back there that day and pulled his carb off and stuck my Qjet on his truck with the adapter plate and made the linkage all bolt up.
I did not tell him anything.

I called 3 days later and asked how it was.
He said the rings have seated and it is running excellent.

I told him go out and pop the hood.
He found out what i did and it took me 2 weeks to get my carb back.

During that 2 weeks i made that Holley run like a champ.. I kind of had to as I stuck it on my car and was driving it daily.

It was the day of the Orange Bowl and I snuck over to his house and swapped the carbs back without telling him.

I gave it a week and called him and said I am coming over to get my carb.
He said he wanted it as it ran super great.
I asked if he had driven it everyday for the last week and he said Yes.

I then told him I swapped his Holley back on last week.
He called BS and went out and looked and called me back and said he never noticed it running any different.

Tune it!
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post #5 of 18 (permalink) Old Mar 29th, 19, 11:51 PM
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Re: Carborator question

Mike, click on this link and call this shop, Custom Rebuilt Carburetors buys, sells, and rebuilds all kinds of carburetors I think he can solve your worn out carb problem. I have used him and the carbs when returned, were basically bolt on and go. Good luck!!

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post #6 of 18 (permalink) Old Mar 30th, 19, 5:49 AM
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Re: Carborator question

Edelbrock. Set it & forget it.
The new 800 cfm AVS2 has annular pri boosters for better throttle response.
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post #7 of 18 (permalink) Old Mar 30th, 19, 5:49 AM
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Re: Carborator question

as much as I like my old Holley and Qjets, if I was buying new and didnt mind shiny non stock in the engine bay: https://www.summitracing.com/parts/dem-1901



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post #8 of 18 (permalink) Old Mar 30th, 19, 8:30 AM
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Re: Carborator question

I like Mikes answer and Jeff Swisher spelled out what you really should do except for one thing. Most guys, even experienced guys, don't know how to tune a carburetor past setting the idle speed and setting the idle jets for highest vacuum. After that, they live with it, me included. My car (edelbrock 1406) runs pretty good but I have no idea if it could be better or how to find out. I've watched every video I can and none go past what I just said.
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post #9 of 18 (permalink) Old Mar 30th, 19, 11:34 AM
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Re: Carborator question

Like Mike said - "You are going to get a zillion answers".
If it were me ,I contact one of the carb rebuilders that frequent this site and get your QJ properly rebuilt.
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post #10 of 18 (permalink) Old Mar 30th, 19, 4:34 PM
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Re: Carborator question

Fix your original carb.

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post #11 of 18 (permalink) Old Mar 30th, 19, 5:48 PM
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Re: Carborator question

the carborator.....sounds like some new gimicky thing advertised on late night television
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post #12 of 18 (permalink) Old Mar 30th, 19, 7:37 PM
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Re: Carborator question

Try Eric, he's helped many of us out and does top notch work for reasonable cost.

He's on this forum too.

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post #13 of 18 (permalink) Old Mar 30th, 19, 7:45 PM
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Re: Carborator question

From what I remember.... which is difficult these days... is that the Rochester was a 2 BBL and if there was a 4 BBL on a '65, it would have been a Carter... probably about a 500 CFM.

I don't think there were any Quadrajets on those early Malibu's...

You would have the 283 with the PG, 195 HP with the Rochester 2 BBL, 220 HP with the 4 BBL, then the 327 was also available with different configurations...
Shooting from the hip...
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post #14 of 18 (permalink) Old Mar 30th, 19, 7:53 PM
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Re: Carborator question

Quote:
Originally Posted by 427L88 View Post
as much as I like my old Holley and Qjets, if I was buying new and didnt mind shiny non stock in the engine bay: https://www.summitracing.com/parts/dem-1901


Chuck's Garage - Street Demon Carburetor Install & Test Drive - YouTube
Gene, I tried one of these on a pretty stock 350 with weiand stealth intake, msd with 6AL box and headers. It never ran right? I had a little Holley Avenger 570 on it and it was fine but I got seduced by this carb and went for it. They may be great, just not this one for me on that car. It was a 70 El Camino 350, very strong 2004R, 3.73 posi. Sold the car.

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post #15 of 18 (permalink) Old Apr 1st, 19, 1:07 AM
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Re: Carborator question

[quote=Mike]...contact one of the carb rebuilders that frequent this site and get your QJ properly rebuilt. [\quote]
Quadrajet was not available in 1965...


Quote:
Originally Posted by Stalkingbear View Post
From what I remember.... which is difficult these days... is that the Rochester was a 2 BBL and if there was a 4 BBL on a '65, it would have been a Carter... probably about a 500 CFM.

I don't think there were any Quadrajets on those early Malibu's...

You would have the 283 with the PG, 195 HP with the Rochester 2 BBL, 220 HP with the 4 BBL, then the 327 was also available with different configurations...
Shooting from the hip...
Correct on the Quadrajet, those came out in 1966...

But I know the '65s used a Rochester 4 barrel (4GC?), but it was a square bore carb, and NOT a Q-jet...




I think it was mentioned above, but if you want something new (Holley or Edelbrock) then, IIRC, you are going to need a new intake or an adapter. I think the 4GC pattern is different than Holley/EdelbrockÖ


IMO, IF you are a novice and don't have a buddy to tune it, I'd go with an Edelbrock.

Once you go RAT, you never go back...
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